Ultra-Mobile PC (UMPC) is a (not so) new kind of computer which combines the power of Windows XP or Vista with mobile-ready technologies that make it easy to access and use your software on the go. It actually should be portable almost as a PDA with the capabilities of a full PC computer. The UMPCs was originally created as a small form factor tablet PC. It was developed as a joint development exercise by Microsoft, Intel, and Samsung, (under the code name: Project Origami).

MID:

A Mobile Internet Device is an initiative raised by Intel for consumers and prosumers. The device contains a processor and chipset produced by Intel that consume less power than most of the x86 derivatives and are an extension of the Centrino mobile platform. As of today, several platforms have been announced.

The MID will run an embedded version of Linux with a finger friendly user interface modified by Intel, not Microsoft Windows operating system like other UMPCs. However, with the dual-core processor, the device is capable of running Windows XP and Windows Vista.